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HFP01SC heat flux sensor

Self-calibrating heat flux sensor

HFP01SC self-calibrating heat flux sensor™ is a heat flux sensor for use in the soil. It offers the best available accuracy and quality assurance of the measurement. The on-line self-test verifies the stable performance and good thermal contact of sensors that are buried and cannot be visually inspected and taken to the laboratory for recalibration. The self-test also includes self-calibration which compensates for measurement errors caused by the thermal conductivity of the surrounding soil (which varies with soil moisture content), for sensor non-stability and for temperature dependence.

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HFP01SC measures soil heat flux in W/m²

HFP01SC measures soil heat flux in W/m². It is used when the highest level of quality assurance and a high measurement accuracy are required. In essence, HFP01SC is a combination of a heat flux sensor and a film heater. The heat flux sensor output is a voltage signal that is proportional heat flux through the sensor. At a regular interval the film heater is activated to perform a self-test (see figure 4). The self-test results in a verification of sensor contact to the soil and in a new sensitivity that is valid for the circumstances at that moment. The latter is called self-calibration. Implicitly also cable connection, data acquisition and data processing are tested. The result is a much improved accuracy & quality assurance of the measurement relative to measurements with conventional sensors such as model HFP01.

Unique features and benefits

  • low thermal resistance
  • large guard area (required by the ISO 9869 standard)
  • low electrical resistance (low pickup of electrical noise)
  • high sensitivity (good signal to noise ratio in low-flux environments)
  • robustness, including a strong cable (essential for permanently installed sensors)
  • IP protection class: IP67 (essential for outdoor application)
  • incorporated film heater for self-testing


Measurand heat flux
Measurement range -2000 to +2000 W/m²
Sensitivity (nominal) 60 x 10⁻⁶ V/(W/m)²
On-line functionality testing self-test including self-calibration
Sensing area 8 x 10⁻⁴ m²
Sensor thermal resistance 81 x 10⁻⁴ K/(W/m²)
Rated operating temperature range -30 to +70 °C
IP protection class IP67
Film heater resistance 100 Ω ± 10 %
Film heater rated power supply 9 to 15 VDC
Interval between self-tests 6 hr
Heating interval duration 180 s
Power consumption daily average 0.02 W
Standard cable length 2 x 5 m
Options longer cable length (10, 15, 20, 30, 40 m)
  • longer cable (2 x), in multiples of 5 m, cable lengths above 20 m in multiples of 10 m


Suggested use

  • high-accuracy scientific measurement of soil heat flux, with a high level of data quality assurance
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